冲模模架基础技术（4）

第六章油膜支承压力和油槽问题1 摩擦系数如何根据表面状态发生变化? 众所周知,摩擦的大小用摩擦系数μ来表示。且摩擦力与摩擦速度和接触面积无关,与荷重P成比例(图6—1)。即 F=μ·P 其中比例常数μ表示两物体相合滑动时的滑动难易程度。上式在两物体表面完全干燥的条件下才成立。但实际上不可能得到完全干燥的状态,多少会有些润滑,因而根据实际速度,μ的值也必然发生变化。下面对各种摩擦状态下的μ值的变化状况作一简述。     

冲模模架基础技术（5）

对模架中的导柱来说,既要求其滑动自如,又具有很小的间隙,只有使用滚珠导柱才能满足上述要求。特别是高速自动冲压、薄板冲裁和精密冲裁等无法经常注润滑油的加工中,主要是使用滚珠导柱模架。滚珠导柱的特点是用摩擦系数很小的滚动摩擦代替滑动摩擦。滚珠导柱的优点如下。(1)活动轻快,模具对合时非常方便。特别是对于大型模操作很简易。(2)高速运转不会发热。(3)磨损量极少。     

冲模模架基础技术（3）

第四章导柱与导套的配合问题1 决定导柱、导套配合好坏的要素是什么?导柱、导套的配合是涉及模架质量的重要因素,但用户对其难以作出判断。大多通过导柱和导套的对合状态和模架的活动状况进行鉴别。但凭借手的感觉来判断配合的好坏有时会出现差错。首先,对安装在模板上导柱的要求是在长时间内保持小间隙。为了掌握导桂、导套的配合间隙,通常也只能用手拉动上模座,视其滑动状况。然后将模架安装在压力机上,并作几次对合运动。再将模架从压力机上卸下,用手轻轻拉动上模座,凭借自己的经验来判断有什么不同的感觉。事实上,模架不可能长时间地保持小间隙,使用一段时间以后,间隙就要增     

冲模模架基础技术（6）

第十章导套的固定方法导套的固定方法有压入固定、粘结固定和压板固定等3种类型。这几种固定方法各有优缺点,下面分别加以叙述。问题1 压入固定法有什么缺点? 这是一种最古老的方法,将过盈的轴压入孔中,可用机械方法进行装配。根据经验,这种固定方法是很可靠的,加工及操作方法也很简单。所以是一种常用的导套固定方法。近来,对模架提出了廉价、高质量和长寿命的要求,用压入法固定导套就出现以下的不足     

冲压标准模架三维装配模型库的开发

介绍了冲压标准模架三维装配模型库系统的功能与结构，阐述了冲压模架三维零件及装配模型库的建立方法，解决了如何自动生成三维模架装配模型的关键问题。     

冲模滚动导柱模架尺寸链设计

就常用的滚动导柱型（滚动体保持在导柱上）模架提出九个公式来限定模架的最大和最小闭合高度，并对一种规格的国际模架进行了校核以判别设计的合理性。     

提高冲模装配精度的有效途径

提高冲模装配精度的有效途径南京人民机械厂（江苏南京２１００１６）陈筱俊装配精度是指模具零件在装配以后的实际相互位置参数与理想的相互位置参数相符合的程度。符合程度愈高，装配精度愈高。提高模具装配精度可从以下几方面着手。１装配基准的选择装配基准是决定装配...     

导向板液压模架平面压边精冲模设计制造

设计了适用于普通压力机的精冲模,采用自制液压模架,以压料板进行平面压边精冲。精冲模以连续自动方式送料,生产效率高。介绍了平面压边精冲工艺方法、精冲对材料要求、冲裁力计算方法、对压力机的要求、凸模凹模刃口尺寸计算及刃口圆角的参数、影响精冲件尺寸及光亮带的因素。介绍了液压模架,以普通压力机和液压模架,替代精冲压力机,取得了很好的技术经济效果。对导向板精冲模的结构进行了剖析,介绍了主要模具结构及零件设计制造经验。     

冷冲模模架质量浅析

冷冲模模架是我厂的出口产品之一。它从80年年产量300～500套发展到目前年产量5000～6000套,品种由两种型号发展到8种型号,各种规格近200种。据外商反映,我们的模架生产多少,他们就要多少。为什么我厂生产的模架会受到如此青眯,其原因是因为我们的模架产品标准水平高,产品质量经过几年来的反复实践和努力不断提高,赢得了用户的信赖。 1、积极采用国外先进标准,促进产品质量提高随着我国经济体制改革的不断深化和工业技术的高度发展,产品更新换代日益加快,随之而来的模具行业越来越被人们重视,其地位显得越来越重要。为了适应经济迅速发展的需     

Continuous Failure Diagnosis for Assembly Systems using Rough Set Approach

Increasingly, companies require faster ramp-up in order to cope with shorter production cycles and greater demand for product variety. Since quality and dimensional problems are one of the major reasons for delay during ramp-up, rapid diagnosis of dimensional failures is of critical concern. Given the lack of historical data and incomplete process knowledge in ramp-up, a Rough Set based diagnosis methodology is proposed which focuses on developing: (1) Self-learning ability to detect new faults as a system undergoes adjustments; and (2) A continuous diagnostic for faults rather than a crisp definition of faults. A case study illustrates the proposed approach.     

装配型企业CAPP与工艺管理系统的实现

通过分析装配型企业工艺工作现状,提出适用这种生产类型的CAPP与工艺管理系统的总体结构,阐述该软件系统三大组成部分:工艺设计、工艺管理和系统管理中主要模块的功能和特点,与传统CAPP系统相比,更能满足装配型企业各应用层次对CAPP的需求.     

Integration of Product Design and Assembly Planning in the Digital Factory

As assembly process planning fulfils the main function of connecting product design to production simulation and thus, the production system itself, a feasible software solution is needed to support this process. Thus, a novel concept is presented that aims at improving the integration of digital product design and assembly planning by introducing a consistent data structuring. This approach helps to reduce redundant tasks and supports the continuous data exchange. It is based on the use of assembly features, i.e. pre-defined geometry elements that contain additional technological information.The prototypical implementation of the concept focuses on the use of commercially available software tools, expanding them with additional functionality for the application of assembly features. The feature-based concept has been tested with a scenario from the automotive supplier industry. For the considered assembly, a comparison between the conventional and the feature-based planning approach is presented in the paper. It points out that the major advantages of the developed concept can be seen in an improved data consistency as well as a higher level of efficiency within the planning activities.     

A highly efficient hybrid inductive joining technology for metals and composites

A hybrid technology of inductive contact joining (ICJ) was developed to join fibre-reinforced thermoplastics (FRP) with metals by using a tool with single-sided heating. In comparison to conventional methods with separate heating, pressing and cooling, the unique new hybrid ICJ process is characterized by combining all three steps into one hybrid process. The maximum temperature is shifted toward the joining zone due to the direct cooling effect of the surface. FE simulations showed the temperature distributions within the joint. The performed experiments provided data for the temperature profile of the process and the resulting strength of the joint, type of damage and microstructural characteristics. Proven advantages include very short cycle time, competitive joint strength and limited influence on the mechanical properties of the metallic component.     

面向功能的覆盖件模具装配设计的实现方法

通过讨论当前模具设计存在的问题，提出了一种面向功能覆盖件模具装配方法，详细介绍了功能树的表达方法、零件的快速装配方法、功能结构单元及其生成。     

模具线切割加工的工艺分析与工艺处理

通过对线切割加工模具零件的工艺分析，提出相应的工艺处理措施，以提高生产效率和加工质量。     

Development of a technology orientated programming system for industrial robots

The disassembly of used goods is characterized by strongly varying quantities and a wide range of different kinds and states of products. Furthermore, the requirements of a disassembly system are determined by the disassembly object, by the process as well as by the disassembly system itself. As a result of the high labor costs in industrial countries and the huge amount of used goods, an automated disassembly is favored for the industrial disassembly. New methods for the programming of industrial robots have to be developed because the costs for a programming of small lot sizes are a key factor of the economic efficiency of small and medium sized enterprises (SME). In this paper an off-line programming environment for programming of industrial robots in the field of automated disassembly is presented. The exemplary implementation is realized at a pilot disassembly system, which was built up at the Institut für Werkzeugmaschinen und Fabrikbetrieb (IWF) of the Technische Universität Berlin.     

Assembly support using AR technology based on automatic sequence generation

This paper addresses the challenge of integrating simulation and augmented reality tools into final assembly operations. The study presented, comprises an assembly sequence generation algorithm, for the creation of assembly sequences and steps, carried out by engineers with the use of CAD data and any additional input concerning the product. This information is then delivered to the AR (Augmented Reality) module, which is responsible for the visual instructions of the assembly task. The AR module is based on an algorithm that creates the virtual instructions, having as basis the assembly sequence of the specific product. The instructions are stored in the form of a template.     

Process force and technology model for designing and controlling finishing operations with rotating grinding tools

Today the technological design of fine machining processes like finishing of plane surfaces is still a procedure based on experience. In addition, finishing technology is the result of an empirical approach. Innovative methods for designing and controlling finish operations make use of models and the implementation of procedures that allow the derivation of optimal technological parameters and process control strategies as well as the prediction of cutting behaviour of abrasive tools. These process and technology models are based on measuring and evaluating process variables like process forces or cutting torque and parameters of the electric drive like motor current or torque. With these models a finishing process is achieved on the basis of mathematical and technological principles wherein the grinding tool works in a self-sharpening condition providing optimal results.     

大型构件现场装配焊接技术

叙述了大型结构件现场施工焊接遇到的问题,通过优化设计,解决了基础预埋件变形带来的困难.采取合理的装配焊接方法,在施工现场对大型结构件实施精密焊接,解决了安装中存在的困难.